Machine tool transmission and control



Dec. 11, 1951 A. K. WATCHER ET AL 2,578,113

MACHINE TOOL TRANSMISSION AND CONTROL Filed April 10, 1947 7 Sheets-Sheet l INVENTOR.

.ALBERT K. WATCHER BY WILLIAM BDULANEY ATTORNEYS Dec. 11, 1951 WATCHER ETAL 2,578,113

MACHINE TOOL TRANSMISSION AND CONTROL Filed April 10, 1947 7 Sheets$heet 2 II I 2| I J a S INVEN TOR.

ALBERT K. WATCHER BY WILLIAM B. DULANEY T .Q... TQM

ATTORNEYS 1951 A. K. WATCHER ET AL 2,578,113

MACHINE TOOL TRANSMISSION AND CONTROL Filed April 10, 1947 7 Sheets-Sheet 3 IN VEN TOR.

ALBERT WATCHER. wmunm s. DULANEY.

AT T0 RN EYS 1951 A. K. WATCHER ET AL 2,578,113

MACHINE TQOL TRANSMISSION AND CONTROL Filed April 10, 1947 v Sheets-Sheet 4 2 Mai IN V EN TOR. w

J ALBERT .UJATCHER- WILLIAM .ISULANEY.

BY TMMT N' AT TO RN EYS Dec. 11, 1951 A. K. WATCHER ETAL L 2,578,113

MACHINE TOOL TRANSMISSION AND CONTROL Filed April 10, 1947 7 Sheets-Sheet 5 INVENTOR.

ALBERT K. UATCHER. wmuam a. nuumav.

P TLQM W ATTORNEYS 1951 A. K. WATCHER ETAL 2,578,113

MACHINE TOOUTRANSMISSION AND CONTROL Filed April 10, 1947 7 Sheets -Sheet 6 II I ll INVENTOR.

ALBERT UATCHER. B LOILLIAM BJBULANEY.

m mg ATTORNEYS Dec. II, 1951 V A. K. WATCHER ETAL 2,578,113

MACHINE TOOL TRANSMISSION AND CONTROL Filed April 10, 1947 7 Sheets-Sheet? Patented Dec. 11, 1951 UNITED STATES PATENT OFFICE MACHINE TOOL TRANSMISSION AND CONTROL Albert Keith Watcher, Kenwood, and William B. Dulaney, Cincinnati, Ohio, assignors to The Cleveland Automatic Machine Company, Norwood, Ohio, a corporation of Ohio Application April 10, 1947, Serial No. 740,682

22 Claims. 1

an improved electrically operated and controlled rate and direction transmission mechanism which is simple to set up, efficient in operation, and economical to manufacture.

And still a further object of this invention is to provide a fully electrically controlled power transmission system for a milling machine which is fully interlocked so as to avoid any possible damage to the machine upon the incorrect operation of the various control devices by the operator.

It is also an object of this invention to provide a fully electrically controlled mechanical power transmission for actuating the knee, saddle, table, and cutter spindle of a milling machine in a predetermined cyclical relationship including an arrangement of simple character for setting up the machine to function through particular operating cycles as desired.

Further features and advantages of this invention will appear from a detailed description of the drawings in which: I

Figure l is a front left-hand side perspective view of a milling machine incorporating the features of this invention.

Figure 2 is a rear right-hand side perspective view of the milling machine of Figure 1.

Figure 3 is a transverse section trough the knee, saddle, and table on the line 33 in Figures 1, 2, and 4.

Figure 4 is a cross-section through the knee,

saddle, and table mechanism indicated by the line 44 in Figures 1 and 3.

Figure 5 is a diagrammatic view of the cutter spindle drive mechanism for the milling machine.

Figure 6 is a diagrammatic view of the transmission drive mechanism for the knee, saddle, and table of the milling machine.

Figure 7 is an elementary wiring diagram of the control circuit for the milling machine.

As illustrative of a machine tool to which this invention is particularly well adapted, there is shown a milling machine comprising a base It) I and having a column II on top of which is carried the usual over arm I2 from which depend the arbor supports I3 and H for carrying a suitable cutter arbor and milling cutters connected to the cutter spindle l5 journaled in the column II. On the front of the column is mounted, on suitable guideways IS, the knee l1 having guideways l8 upon which is mounted the saddle. I9. The saddle in turn has suitable guideways 20 upon which is carried the work table 2| having the usual work and fixture surface 22.

Spindle drive transmission Referring particularly to Figure 5, there is shown a preferred form of spindle drive transmission for rotating the cutter spindle l5. Power is derived from the spindle drive motor 23 having a drive shaft 24 on the outer end of which is mounted a variable pitch pulley comprising a member 25 fixed to the shaft 24 and an adjustable member 26 driven by the shaft 24 but axially slidable thereon relative to the member 25. Suitable V-belt 21 operating between the members 25 and 26 operates over the members 28 and 29 ;of the variable pitch idler pulley which also has a, member30 rigidly formed with the member 28, the member 29 being axially slidable relative to the members 28 and 30. A second V-belt 3| operating between the members 29 and 30 engages the members 32 and 33 of the driven pulley, the

member 33 driving the pinion shaft 34 but axially slidable, thereon for relative adjustment with respect to the member 32.

On the pinion shaft 34 is formed a bevel pinion 35 which in turn drives a bevel gear 36 formed .40 .which in turn drives the low speed gear 4| journaled on the work spindle [5. A clutch spool 42 axially slidable on the spindle 15 but mounted in driving engagement therewith has a friction clutch 43 for ,interengaging drive from the gear 39 through the clutch spool 42 to the spindle l5. A positive jaw clutch 44 is also provided between the spool 42 and the gear 4| so that the clutch I may be moved to effect a positive driving engagement of the gear 4| to-the spindle [5.

The spindle drive motor shaft 24 isprovided with a brake drum 45 about which is provided a brake band 45 operable by a suitable actuating member 41 so that the spindle drive motor shaft 24 and the transmission may be quickly brought to a stop when the motor 23 is de-energized.

' Power take-offfrom a spiral gear 48, a mating 3 gear 49 of the coolant pump 50, and to a gear of the lubricating pump 52 provides means to supply the machine with coolant and lubricating oil whenever the spindle drive motor is operating.

Infinitely variable speed rate changes may be effected in the work spindle by adjusting the variable pitch belt drive 2I3I by means of the electrically operated control motor or spindle speed regulator 53 which has a shaft 54 upon which is formed a thread 55 operating in a nut 56 connected to the lever 51 which lever has a projecting arm 58 and roller 59. engaging the, member 26 of the variable pitch pulley 2 5-25 and has an arm 60 and a roller 6| engaging the member 33 of the variable pitch pulley 3233, the whole lever being pivotally mounted on a suitable shaft 62 carried in the column of the milling machine. Thus, by energizing the motor 53 in one direction or other, the nut may be moved back and forth to cause rocking action of the lever 51 on the pivot 62 to relatively adjust the variable pitch pulleys 2,52 6 and 3233 to vary the speed rate between the motor shaft 24 and the pinion shaft 34 in an infinitely variable manner.

The back gear and high speed clutch spool 42 is shifted by means of the actuator motor G3 which drives the operating screw 84 through an overload clutch 65, the screw 64 in turn operating in a nut 66 which is connected to an operating lever 61 pivotally mounted on a suitable shaft 68 carried in the milling machine column, the lever 61' engaging the Spool 42 so that when the motor 63' is energized in one direction or the other, the clutch may be shifted to the high speed position of engagement of the friction clutch 43 or to the low speed drive position of engagement of the jaw clutch 44:.

Feed and rapid traverse tranmission mechanism The feed and rapid traverse drive transmiss ion for actuating the knee, saddle, and table mechanism of the milling machine is shown diagramatically in Figure 6. The drive power for actuating these members is obtained from the feed and rapid traverse drive motor 69 which is appropriately mounted in the knee ll of the milling machine, which has a driving pulley 30 mounted on its shaft II which drives suitable belt means l2 operating over the driven pulley I3. The driven pulley I3 is fixed to a rapid traverse output shaft it upon which is also fixed the member 75 forming one member of the variable pitch pulley It-I 6', the member 16 being movable axially on the shaft 14 in driving relation thereon relative to the fixed member I5 A suitable V-belt 'I'I operating over the variable pitch pulley IE-I6 operates between the members I8 and I9 of the idler V-belt pulley l8--T9, the member I9 being formed integral with another member 30, both of which members 79 and 89 move axially of the member I8 and a member 8| of a second variable pitch pulley. A second V-belt 82 operates between the members so and 8| of the variable pitch pulley 86--8I and between the members 83 and 8:4 of the variable pitch pulley 83-84 in which the member 84 is adjustable axially in driving relationship on the feed output shaft 85.

By axially adjusting the position of the members l6 and 84 on the shafts I4 and 85, variation in feed rate outputv may be effected in the shaft 85 in an infinitely variable manner. This adjustment may be accomplished by means of the shifting lever 86 carried on a suitable pivot 81 in the knee H of the millin machine and which lever has a roller 88 engaging between the members it and 84 so that as the outer end 86a of the bellcrank arm 86 is actuated, the members It and 84 will be adjusted to vary the speed through the V-belts If and 82 from the motor 69 and the shaft 85. The lever arm Eta is actuated by a roller 89 carried in its outer end which engages the feed rate control cam til carried on a suitable shaft 9i to which is connected the worm wheel 92 which is driven by the worm 93. The worm 93 is formed on a shaft 9,4 having another worm wheel es which in turn is driven by a worm 98 carried on the shaft Q'E of the feed rate regulating motor es. Thus, by energizing the motor 93 in either direction, the rate of feed may be infinitely varied to any desired value.

Feed driving power from the shaft is transmitted through a Worm 99 to a worm wheel I96 which is fixed on a shaft IGI having a gear I82 which in turn drives a gear I93 on a shaft IE4. A gear I65 on the shaft Ifl i drives a gear IUS which is journaled on the power input shaft till to the knee, saddle, and table mechanism. The rapid traverse drive power from the shaft iiis transmitted through the spiral gear I08 to the spiral gear I09 also journaled on the shaft I 61. A shiftable clutch spool member IIfi engages a friction clutch III to connect rapid traverse drive power to the shaft It? or engages a jaw clutch I I2 to connect the feed drive power to the shaft IE7. The clutch spool member Iii may be shifted for feed orrapid traverse drive powerby an appropriate apparatus such as the lever H3 carried on a suitable pivot H 3 which is moved by a nut H5 carried on an operating screw I It formed on the motor shaft of the feed and rapid traverse control motor I ll. The feed and rapid traverse power from the shaft It": is transmitted to the knee, saddle, and table mem bers as follows: The knee is operated in vertical movement by engaging the clutch spool H8 with the clutch member II9 formed on the gear I29 connected to be driven from the shaft This clutch spool is mounted on splined driving connection with the shaft I2I which has a bevel gear I22 which engages a mating bevel gear I23 fixed to the elevating screw I2? operating in the nut I25 fixed to the milling machine column II. The clutch spool H8 is shifted into or out of power engagement to drive the shaft I2! from the shaft [ill by a lever arm I26 carried on a suitable pivot IZ'I in the knee of the milling machine and which lever is actuated by a nut I28 carried on a screw I29 which is operated by the knee actuator control motor 39.

Power to the saddle for cross movement is derived from the gear I28] which drives a gear I3I which is connectable by a suitable clutch spool member i3-2 to the saddle cross feed screw I33 which operates in a nut I35 fixed to the saddle I9. An operating lever I35 is carried on a pivot I36, and actuated by a nut IS'I on the screw- #38 driven by the saddle actuator motor I38, the actuating screw I33 being appropriately journaled against axial movement in the knee ii.

The work table is driven from the gear I35 which drives the gear I43 connectable by the clutch spool I l-I to drive the spline shaft hi2 journaled against axial movement in the knee i7 by suitable bearing means.

'of the milling machine in appropriate bearings; A

.mating bevel gear I44 in driving relationship with :a shaft I45, which is suitably journaled in the saddle I9 and in driving relationship with a second bevel gear I46 which is in driving engagement with a bevel gear I46a journaled against axial movement in the saddle I 9. The last mentioned bevel gear I46a has a spline driving connection with the table feed screw I41 journaled against axial movement in the work table ZI. A suitable nut I48 is engaged by the threaded portion I4Ia of the table feed screw I41, the nut I being attached to the saddle I6 of the milling machine so that rotation of the screw I41 effects longitudinal table movement on the saddle relative to the saddle I9. Clutch member I4I for engaging or disengaging the table feed and rapid traverse drive power is controlled by a lever I49 carried on suitable pivots I56 in the knee of the milling machine and is operated by a nut I5I operating over a screw I52 driven by the table actuator motor I53.

Manual table control and interlock mechanism Referring particularly to Figure 7 showing the elementary wiring diagram, the operation of the machine is as follows: The main drive spindle motor is started by closing either start button I54 appropriately located on the column or push button I55 located on the knee of the machine to energize relay DMS. A suitable manually operated reversing and off switch I56 is set for the desired direction of rotation of the cutter spindle.

Energizing relay coil DMS closes contact DMSb to lock in the circuit after the switches I54 or I55 are released.

The desired spindle speed is selected by appropriately energizing the spindle clutch actuator .the movement of the nut 66 to limit the extent of travel of the nut 66 and the positioning of the clutch member 42 by breaking the respective circuits to the relay coils CMF or CMR, respectively.

I Having the spindle speed thus properly selected .and operating, the work table 22 may be caused ,to move to the left (facing the front of the machine) by moving the control lever I 6I to the feed forward position I6Ia where the lever will be held by the spring detent I62, Figure 3, carried 1 on a pivot pin I63 in the saddle I9 and having a pointed end I64 which operates in the neutral positioning notch I65 and in the forward feed notch I66 and the reverse feed notch I61 for the .table 22, a suitable compression spring I63 being utilized to hold the point I64 in engagement with ,the notches I65, I66, and I61 on the cam I68 fixed .to the rocker shaft I69 carrying the lever I 61. -With the table control lever I6I in the forward feed position I6Ia, the contact I16 is opened and contact I'lI is closed, completing the circuit to the coil FMF which closes contact FMFa to complete a circuit to the coil FF which in turn closes .contacts FFb to energize the feed drive motor 69 in a forward direction. Contact I 12 is opened and contact I13 is closed, completing a circuit to the coil TCR which opens contact TCRa'and closes The spindle belt adjusting Ill) contact TCRb, completing a circuit to the coil TMF which closes contacts'TMFa, energizing the table clutch actuator motor I53 in forward direction which causes switch I14 to close. The table clutch MI is engaged, applying driving power to the work table. Switch I15 is opened, breaking the circuit to the coil TMF which opens contacts TMFa, de-energizing the table clutch actuator motor I53 upon completion of engagement of the table clutch I4I. An electrical interlock arrangement is provided between the table control lever I6! and the saddle control lever I16 so as to prevent movement of either table or saddle in the event the saddle control lever I16 is moved to a feed-in position while the table control lever is in a, feed forward position. Under these conditions, should the saddle control lever I16 be moved to a feed-in position I16a, Figure 4, contact I11 is closed and contact I18 is opened, breaking the circuit to the coil TCR which restores contact ICE?! to its normally opened condition and contact TCRu to its normally closed condition, completing a circuit to coil TMR since switch I14 has been previously closed, closing contacts TMRa, energizing the table clutch actuator motor I53 in reverse direction which causes contact I15 to close and table clutch I4I is disengaged to stop power actuation of the work table 22. Contact I14 is opened, breaking the circuit to the coil TMR which opens contacts TMRa, de energizing the table clutch actuator motor I53 upon completion of disengagement of the table clutch I4I. Contact I19 is opened and contact I80a is closed but the circuit is not complete to the coil SCR since contact I16 is open, thus the saddle clutch will not be engaged.

Interlock mechanism is also provided between the table control lever Ifil and the saddle control lever I16 to prevent movement of either table or saddle if the saddle control lever is moved to feed-out position i161). Under these conditions, contact I 86a is closed and contact I8Ia' is opened, breaking circuit to the coil TCR which restores contact TCRb to its normally opened condition and closes contact TCRa, completing circuit to coil TMR. since switch I14 has been previously closed, closing contacts TMRa, enerv table clutch I is disengaged to stop application of power drive to the work table. Switch I14 is opened, breaking circuit to the coil TMR which opens the contacts TlVlRa, de-energizing the table the table or knee if the knee control lever I8I is moved to feed-up or feed-down position while the table control lever is in feed forward position. Contact I82 is closed and contact I93 is opened, breaking circuit to coil TCR which restores contact 'ICRb to its normally opened condition and contact TCRa to its normally closed condition,

completing the circuit. to the coil TMR since contact I14 has been previously closed, closing contacts TMRa energizingtable clutch actuator motor. This results in contact I15 being closed and the table clutch I4I disengaged. Contact I14 is opened, breaking circuit to the coil TMR which opens contacts TMRa, die-energizing the table clutch actuator motor upon completion of disengagement of the clutch MI. Contact I82 is closed but the circuit is not complete to the coil SCR since contact IIIl is open, breaking the circuit to the coil RI, opening RIa.

When it is desired to cause the work table 22 to move to the left in rapid traverse move ment, the control lever IBI is moved to the rapid traverse forward position EBIb, Figure 3, causing the end Ili l of the detent I32 to ride up on the surface Ifita of the detent cam I68 which is so arranged that when the lever IIiI is released it will automatically return from the rapid traverse position IcIb to the feed forward position IISIa. In addition to the results obtained by moving the control lever I6I to the feed forward position I6Ia, above described, contact I83 is also closed, completing a circuit to the coil RM, opening contact RMa, breaking circuit to the coil RMR and closing contact RMb, completing a circuit to the coil RMF to close contacts RMFa to thereby energize the rapid traverse clutch actuator motor H1 in the forward direction with the result that the contact I84 is closed. The rapid traverse clutch i It is transferred from jaw side to friction side, thereby by-passing the variable speed belt transmission to connect driving power from the motor 69 directly to rapidly to actuate the table screw as described in connection with Figure 6. The interlocking mechanism described in connection with the actuation of the saddle control lever and the knee control lever when the table control lever is in forward feed position is equally effective when the table control lever is in rapid traverse forward position.

When the table control lever IEI is released to return to the feed forward position ISIa, contact I83 is opened, breaking circuits to coils EMF and RM, opening contacts RMFa, de-energizing the rapid traverse clutch actuator motor H1 in the forward direction, and closing contact RMa, completing circuit to coil RMR since contact I84 is already closed, closing contacts RMRa, thereby energizing the rapid traverse motor in reverse direction. This causes the rapid traverse clutch Hi3 to be transferred from the friction side to the jaw engagement side to thereby reinstate the variable speed drive belt transmission back to actuating the work table. Contact I84 is opened upon completion of the engagement of the jaw clutch side of the rapid traverse clutch I.I0., thereby breaking circuit to the coil RMR, opening contacts RMRa de-energizing rapid traverse clutch actuator motor.

When it is desired to have the work table 22 moved to the right at feed rate, the control I6I is moved to the feed reverse position I550, Figure 3. This will cause contact I85 to open and contact I86 to close, completing a circuit to the QQil FMR which closes contact FMRa which completes a circuit to the coil FR to close contacts r'Ra which energizes the feed drive motor in reterse direction. Contact H2 is opened and contact I13 is closed, completing a circuit to the coil TCR which opens contact TCBa and closes contact TORI), completing a circuit to the coil TMF TMFa de-energizing the table clutch actuator motor upon completion of engagement of the clutch I4I.

Interlock mechanism is provided under these conditions of operation of the table control lever IGI and the saddle control lever I15 to prevent movement of either the table or the saddle if the saddle control lever is moved to feed-in position while the table control lever is in the feed-reverse position IGIc. Contact I11 is closed and contact I18 is opened, braking circuit to the coil TCR which restores contact TCRb to open condition and contact 'ICRa to closed position, completing a circuit to the coil TMR since contact I14 has been previously closed so as to close contacts TMRa to energize the table clutch actuator motor I53 in the reverse direction. Contact I15 is closed and the table clutch I4I disengaged, disconnecting power to the table, while the contact I14 is opened, breaking a circuit to the coil TMR to open the contacts TMRa, de-energizing the table clutch motor upon completion of the disengagement of the table clutch I4I. Contact I19 is opened and contact I800, is closed but the circuit is not complete to the coil SCR since contact I is open.

Interlock is also provided under condition when the table control lever is in feed-reverse position I6 Ic so that the saddle control lever I15, when operated to feed-out position, will stop operation of the table or saddle. Contact ISQa is closed and contact iSIa is opened, breaking circuit to coil TCR which restores contact TCRb to its open condition and contact TCRa to closed condition, energizing coil 'IMR, since contact I14 has been previously closed, so as to close contacts TMRa to energize table actuator motor in reverse direction. This closes contact I15, disengaging the table clutch and ultimately opening contact I14 which opens circuit to coil TMR which in turn opens contacts TMRa. to stop the table actuator motor upon completion of disengagement of the table clutch IllI. Contact I19 is opened and contact IBM is closed but the circuit is not complete to the coil SCR since contact I85 is open.

Further interlock control mechanism is provided between the table control lever I6I and the knee control lever I8I to prevent movement of either the table or knee if the knee control lever is moved to feed-up or feed-down position while the table control lever is in reverse position I6Ic. Contact I82 is closed and contact 183 is opened, breaking the circuit to the coil TCR which retores contact TCRb to its open position and closes contact TCRa, energizing coil 'IMR. and, through closed contact I14, closing contacts 'IlVlRa to reversely actuate the table clutch motor I53 which causes contact I15 to be closed and disconnect the table clutch I4I and finally opens contact I14 breaking circuit to coil TMR which opens contact TMRa stopping the clutch actuator motor after the clutch I4I has been disengaged. Contact I82 is closed but the circuit is not complete to coil KCR since contact I85 is open, breaking circuit to coil RI and opening contact Rio.

When it is desired to actuate the work table to the right in rapid traverse movement, table control lever I6I is positioned at ISId. In addition to all the results above set forth for the position of the control lever ItI in the reverse feed position ISIc, contact I83 is also closed, completing a circuit to coil RM, opening contact RMa, breaking the circuit to coil RMR and closing contact RMb, energizing coil RMF and closing contacts RMFa, thereby energizing rapid traverse clutch actuator motor I I1 in the forward direction causing contact I84 to close, and to engage the friction rapid traverse clutch I-IU for rapid traverse actuationof the work table in the reverse direction. Interlocking mechanism, as described above, are equally effective whether the table isv moving in feed or rapid traverse rates in the reverse direction. The release ofthe lever I 6| will cause it to automatically return from the rapid traverse reverse position Mild to the feed reverse position I6Ic. Contact I83 is opened, breaking circuit to coils RMF and RM and opening contacts RMFa, de-energizing the rapid 1o clutch, breaking circuit to coil RMR and opening contacts RMRa.

There is thus provided, in an electrically controlled milling machine mechanism, an arrangement wherein an electrical interlock mechanism is provided between the table transmission and the knee and saddle transmissions wherein the positioning of the table control lever in the feed and rapid traverse positions in either direction sets up electrical circuits so that in the event the operator would inadvertently move the saddleso and/or the knee control levers power to th respective movable members of the machine is automatically cut off to prevent damage or harm to the work and cutters.

Manual saddle control and interlock mechanism To cause the saddle to move at feed rate toward the column of the milling machine by positioning the saddle control lever I16 in the feed-in position I16a, a detent cam arrangement like that described for the table control lever I6I, but not shown, controls the lever I16 so that it will be held automatically in the feed-in position I16a or feed-out position I16b but must be held manually in the respective rapid traverse 5 in and out positions I160 and I16d. When the lever I16 is moved into position l16a, contact I18 is open and contact I11 is closed; completing a circuit to the coil FMF, closing contact FMFa which energizes coil FF to close contacts PF?) to energize the feed drive motor in forward direction. Contact I19 is opened and contact I89a is closed, energizing coil SCR which opens contact SCRa and closes contact SCRb, energizing coil SMF which closes contacts SMFa, energizing saddle clutch actuator motor I39 in forward direction which causes contact I88 to close and the saddle clutch I32 to engage to apply feed drive power to the saddle screw. Contact I89 is opened,

de-energizing coil SMF which opens contacts 00 SMFa, de-energizing the saddle clutch actuator motor 139 ucon completion of engagement of I the saddle clutch ISI. 7 I l'l'nte"rlock; mechanism is provided between the saddle control lever I16 and the table control 86 lever I6! which prevents movement of either the" saddle or table if the table control lever is moved to feed-forward position while the saddle control lever is in feed-in position. Contact I1I is closed and contact I18 is opened, de-ener- 0 gizing coil SCR which opens contact SCRb and closes contact SCRa to energize coil SMR, since contact I88 has been previously closed, to closecontacts SMRa, energizing the saddle clutchactuator motor in reverse direction. Contact The rapid 15 I89 is closed and the saddle clutch is disengaged,

and the contact I88 is opened, de-energizing the coil SMB and opening contacts SMRa upon completion of disengagement or the saddle clutch by the saddle clutch actuator motor. Contact I12 is opened and contact I13 is closed but the circuit is not complete to energize coil TCR since contact I18 is open.

Interlock is also provided between the saddle control lever I16 and the table control lever I6I which prevents movement of either the saddle or table if the table control lever is moved to feed-reverse position while the saddle control lever is in feed-in position. Contact I86 is closed and contact I is opened, de-energizing coil SCR to open contact SCRb and to close contact SCRa to energize coil SMR, since contact I88 has been previously closed, to close contacts SMRa, energizing the saddle clutch actuator motor in reverse direction. Contact I89 is closed and the saddle clutch is disengaged and the contact I88 is opened, de-energizing coil SlVIR to open contacts SMRa, de-energizing the saddle clutch actuator motor upon disengagement of the saddle clutch I32. Contact I12 is opened and contact I13 is closed but circuit is not complete to coil TCR since contact I18 is open.

There is an interlock provided between the saddle control lever I16 and knee control lever i8I which prevents movement of either the saddle or knee if the knee control lever is moved to a feed-up position I8Ia while the saddle control lever is in a feed-in position. Contact I82 closes and contact I83 opens, de-energizing coil FMF and opening contact FMFa, de-energizing coil FF to open contacts F'Fb, de-energizing the feed drive motor 69. Contact I90 opens and contact I9I closes but contact I19 is open so that coil FMF remains de-energized.

Interlock is also provided between the saddle control lever I16 and the knee control lever I8I which prevents movement of either saddle or knee if the knee control lever is moved to feed-down position while the saddle control lever is in feed-in position. Contact I82 closes and contact I83 opens, de-energizing coil FMF, opening contacts FFb de-energizing feed drive motor. Contact I92 opens and contact I93 closes but .contact I19 is open so that the coil FMR remains de-energized.

, In order to cause the saddle to move toward the column at rapid traverse rate, the saddle lever I16 is moved in the rapid traverse in and the rapid traverse clutch III) is transferred from feed jaw side to friction rapid traverse side for rapid operation of the saddle screw I33.

'Interlocks are equally effective whether the saddle is moving at feed or rapid traverse rates to control the simultaineous stopping of the saddle and table as aforementioned. Release of the lever I16 from rapid traverse in position I causes it to automatically return to the feed-in position I16a. Contact I 94 opens, de-energizing coils RMF and RM, opening contacts RMFa, de-

energizing the rapid traverse clutch actuator motor in the forward direction and closing contact RMa to energize coil RMR, since contact 11 I8 is already closed, thus closing contacts RMRa to energize the rapid traverse clutch actuator motor in reverse direction to move the rapid traverse clutch from friction to positive jaw feed side. Contact I84 is opened upon completion of en a ement of the jaw clutch side of the rapid traverse cl 'tch, thereby de-energizing coil RMR an o ening contacts RMRa.

When it is desired to cause the saddle to feed out a dv f om the column, the saddle control lever I1 is moved to the feed out position I16b, Fi u e to open contact IBM and close contact IBM, ener izin coil FMR to close contact FMPa. to ene gize coil FR, closing contacts FRa to energize the feed drive motor in reverse direcfion. Contact I19 is opened and contact IBM is closed. energizing coil SCR which opens cont ct SCRH. and closes contact SCRI), energizine coil SMF. closing contacts SMFa to energize sa d e clutch actuator motor I39 in forward direction, closing. contact I88, engaging the saddle clutch to apply driving power to the saddle feed screw I 33. and opening contact I89, de-energizing coil 8M1 to open: contacts SMFa, again de-energizing the saddle clutch actuator motor upon completion of engagement of the saddle clutch.

Interlock mec anism is provided between the saddle control lever I16 and the table control lever IR! to prevent movement of either saddle or table if the table control lever is moved to feed-forward position while the saddle control lever is in feed-out position. Contact I1I is closed and contact I18 is opened, de-energiizing coil SCR to open contact SCRb and close contact SCRa. energizing coil SMR, since contact I 88 has been previously closed, closing contacts SMR-c. energizing the se ddle; clutch actuator motor I39 in reverse direction which results in the closing of contact saddle clutch I32, and the opening of contact I88 to de-energize coil SMR and open contacts SMRa de-energizin saddle clutch actuator motor on disengagement of the saddle clutch. Contact I 2 is opened and contact I13 is closed but coil TCR is not energized since contact I'8la is open.

Int rlock is providedv between the saddle control lever I15 and the control lever IBI which prevents movement of either saddle or table if the table control lever is moved to feed re- Verse position while the saddle control lever is in feed-out position. Contact I85 is closed and contact I85 is opened. de-energizingcoil SCR which opens contact SCRb: and closes contact SCRa to energize coil SMR, since contact I88 has been previously closed, to close contacts SMRa, energizing the saddle clutch actuator motor in reverse direction, which results in the closing of contact I 89, disengagement of the saddle clutch, and the ultimate openin of the: contact I83 to tie-energize. the coil; SMR' which opens contacts SMRa, de-energizing the saddle. clutch actuator. motor upon completion of the disengagement of the saddle clutch. Contact I12 is openedv and contact I13 is closed but: circuit is not complete to energize coil TCR, since the contact I8 la is open.

Interlock is. also provided between the saddle control lever I16 and the knee: control lever I8'I which prevents. movement. of. either saddle or." knee if the. knee; control lever is; moved to feed-- up position when the; saddle; control lever is in. feed-out position. Contact. I 82: closes and. contact I83 opens. de-energizing coil FMR and open- I89, disengagement of the 12' ing contact FMRa, de-energizing coil FR to open contacts FRa, de-energizin the feed drive motor. Contact I99 opens and contact I9I closes but contact I19 is open so that coil FMF is not energized.

An interlock is provided between the saddle control lever I16 and the knee control lever I8! which prevents movement of either saddle or knee if the knee control lever is moved to feeddown position while the saddle control lever is in feed-out position. Contact I82 closes and contact I83 opens, de-energizing coil FMR, opening contact FMRa, de-energizing coil FR which opens contacts FRa, de-energizing the feed drive motor. Contact I92 opens and contact I93 closes but contact I19 is open so that the coil FMR is not energized.

In order to effect rapid traverse outward movement of the saddle, the saddle control I16 is moved to the rapid traverse position I'IGd Where it must be held manually so long as rapid traverse movement is desired. In addition to all of. the results as set forth above when the control lever is in the feed-out position Iltb, contact I94 is also closed, energizin coil RM, opening contact RMa to de-energize coil RMR, closing contact RM!) to energize coil RMF, closing contacts RMFa to energize the rapid traverse clutch actuator motor in a forward direction. Contact I84 is closed and rapid traverse clutch I III is transferred from jaw side to friction rapid traverse side to effect rapid traverse driving power to the saddle screw I33.

The interlocks are effective the same as when the control I16 is in the feed-out position I161) so that these interlocks are equally efiective whether the saddle is moving in feed or rapid traverse rates.

Upon release of the lever I16 it automatically returns to the feed position I161) so that contact I94 is opened, de-energizing coils RMF and RM to open contacts RMFa,, de-energizin the rapid. traverse clutch actuator motor H1 in the forward direction and closing contact RMa to energize coil RMR, since contact I84 is already closed, to close contacts. RMRa to energize the rapid traverse clutch actuator motor H1 in reverse direction. This transfers the rapid traverse clutch II I! from friction side to feed jaw side,

contact I84- being opened upon completion of engagement of the jaw clutch side to de-energizethe coil RMR opening contacts RMRa and deenergize the rapid traversev clutch actuator motor.

Manual knee control. and interlock mechanism When it is desired to cause the knee to move upwardly on the column at feed rate, the knee control lever IBI is moved up to the feed-up position I8Ia. This knee control lever is provided with the same type of control and detent cam similar to the cam I68 for the lever IIiIv so that it will automatically stay in the up or down feed positions I8Ia and IBM) but must be held in the respective rapid traverse positions INC and IilId. When the control lever I8-I is in the up-feed position I8Ia, contact 190 is opened and contact I9I is closed, energizing coil FMF which closes contact FMFa to energize coil FF, closing contacts FF-b which energizes the feed drive motor in upward direction. Contact I83 is opened and contact I82 isv closed, energizing coil KCR which opens contact KCRa and closes contact KCRb to energize coil KMF to close contacts KMEa to energize: the knee clutch actuator motor I30 in up ward direction. Contact I is closed. the knee clutch H8 is engaged, and contact I96 is opened,

de-energizing coil KMF to open contacts KMFa, de-energizing the knee clutch actuator motor upon completion of engagement of the knee clutch.

Interlock is provided between the knee control lever I8I and table control lever IBI which prevents movement of either the knee or table if the table control lever is moved to feed-forward position while the knee control lever is in feed-up position. Contact FM is closed and contact I19 is opened, de-energizing coil RI to open contact RIa, de-energizing coil KCR which opens contact KCRb and closes contact KCRa, energizing coil KMR, since contact I95 has been previously closed, to close contacts KMRa, energizing the knee clutch actuator motor in reverse direction which results in the closing of contact I95, the knee clutch II8 disengaged, contact I95 is opened'to de-energize coil KMR which opens contacts KMRa, de-energizing the knee clutch actuator motor I30. upon completion of disengagement of the knee clutch H8. Contact I12 is opened and contact I13 is closed but the coil TCR is not energized since contact I83 is open.

Interlock mechanism is provided between the knee control lever l8! and the table control lever I BI which prevents movement of either knee or table if the table control lever is moved to feedreverse position while the knee control lever is in feed-up position. Contact I85 is closed and contact I85 is opened; de-energizing coil RI which opens contact RIa, de-energizing' coil KCR which opens contact KCRb and closes contact KCRa, energizing coil KMR and, through closed contact I95, closes contacts KMRa'energizing knee clutch actuator in reverse direction. Contact I96 is closed, the knee clutch is disengaged, and contact I95 opened to de-energize coil KMR to open contacts KMRa to ole-energize the knee clutch actuator motor upon completion of disengagement of the knee clutch. Contact I72 is opened and contact I13 is closed but the circuit is not completed to energize coil TCR since the contact I83 is open. 1

Interlock mechanism is provided between the knee control lever I8I and the saddle control lever I16 which prevents movement of either knee or saddle if the saddle control leveris moved to either feed-in or feed-out position while knee control lever is in feed-up position. I Contact Iiifla is closed and contact H9 is opened, de-en ergizing coil FMF to open contact 'FMFa, break ing circuit to coil FF to open contacts FFb, deenergizing the feed motor. Since contact I83 is open, closure of contact Il'l cannot complete circuit to the coil FMF and closure of contact IBBa cannot energize coil FMR. I

To cause upward movement of the knee at rapid traverse rate, the knee control lever I8I is moved up to rapid traverse upward position I 8Ic. In addition to all the results as aforementioned with the control-lever in the position I8Ia, contact I9"! is also closed, completing the circuit to energize coil RM, opening contact RM! to de-energize coil RMR and close contact RMb to energize coil RMF to close contacts RMFa which energizes rapid traverse clutch actuator motor in the forward direction. Contact I84 is closed and rapid traverse. clutch I I9 is shifted to the friction rapid traverse side to thus effect the rapid upward movement the knee.

Interlocks are equally effective in the position I8Ic as in the position I8Ia for both upward feed and rapid traverse movements of the knee.

Release of the control lever I 8| when in the position IBI-c, causes it to return to position I SI (1 so, that contact I9! is opened, de-energizing coils RMF and RM to thus open contacts RMFa, deenergizing the rapid traverse clutch actuator motor II! in the upward direction and closing contact RMa, energizing coil RMR, since contact I84 is already closed, closing contacts RMRa to thereby energize the rapid traverse clutch actuator motor in reverse direction to shift the rapid traverse clutch to feed jaw side and open contact I84 upon completion of the engagement of the jaw clutch side to thereby de-energize the coil RMR and open contacts RMRa, de-energizing the rapid traverse clutch actuator motor.

To cause downward feeding movement of the knee, the knee control lever IBI is moved to the feed down position I8Ib. Contact I92 is opened and contact I93 is closed to energize coil FMR to close contact FMRa to energize coil FR which closes contacts FRa which energizes the feed drive motor in the reverse direction. Contact I83 is opened and contact I82 is closed to energize coil KCR which opens contact KCRa and closes con-, tact KCRb to energize coil KMF which closes contacts KMFa, energizing the knee actuator motor in upward direction, resulting in opening of contact I95 andthe engagement of the knee clutch I32 andthe opening of the contact I96 to deenergize the coil KMF and open the contacts KMFa de-energizing the knee clutch actuator motor upon completion of engagement of the knee clutch. v

Interlock mechanism is provided between the knee control lever I8I and the table control lever IBI to prevent movement of either the knee or table if the table control lever is moved to feed-in position while the knee control lever is in feeddown position. Contact III is closed and contact I19 is opened, de-energizing coil RI to open contact RIa' to de-energize coil KCR which opens contact KCRb and closes contact KCRa to energize coil KMR, since contact I95 has been previously closed, closing contacts KMRa to energize the knee clutch actuator motor in re- ,7 verse direction which results in contact I96 being closed, the knee clutch being disengaged.

and the contact I95 opened to de-energize coil KMR which opens contacts KMRa, de-energizing the knee clutch actuator motor upon completion of. disengagement of the knee clutch.

Contact I12 is opened and contact I13 is closed but the coil T03 is not energized since contact I83 is open. I

Interlock mechanism is provided between the knee control lever I8I and the table control lever IIiI which prevents movement of either the knee or table if the table control lever is moved to feed-reverse position while the knee control lever is in feed-down position. Contact I86 is closed and contact I is opened, de-energizing coil RI so as to open contact R10. to de-energize the coil KCR which opens contact KCRb and closes con-Q tact KCRa to energize coil KMR, since contact but coil TCR is not energized since contact I83 is open. t

.Interlock mechanism is provided between the I tion of all machine elements.

153 knee control lever IBI and the saddle control lever I65 which prevents movement of either knee or saddle if the saddle control lever is moved to either feed-in or feed-out position while the knee control lever is in a feed-down position. Contact IiiI'Ia. is closed and contact H9 is opened, de-energizing coil FMR to open contact FMRa to de-energize coil FR, opening contacts FRa, de-energizing' the feed motor. Since contact I83 is open, closing of contact III will not energize coil FMF and closure of contact IBM will not energize coil FMR.

To effect downward rapid traverse of the knee, the control lever IBI is moved to position I8Id. In addition to all of the results as above set forth with the control lever in position I8Ib, contact I9! is also closed, energizing coil RM which opens contact RMa, tie-energizing coil RMR and closing contact RMb to energize coil RMF to close contacts RMFa to energize the rapid traverse clutch actuator motor in the forward direction, resulting in contact I84 being closed and the rapid traverse clutch being transferred from jaw side to friction side for rapid traverse driving of the knee elevating; screw for rapid downward traverse of the knee.

'Interlocks are equally effective when the saddle is moving in feed or at rapid traverse rates in downward movement.

Release of the control lever ISI, when in position I8Id, allows it to return to the feed-down position I8Ib so that contact I9! is opened, dee'nergizing coils RMF and RM and opening contacts RMFa, ale-energizing the rapid traverse actuator motor in upward direction and closing contact RMa to energize coil RMR, since contact I84 is already closed, closing contacts RMRa to thereby energize the rapid traverse clutch actuator motor in reverse direction which results in the rapid traverse clutch being transferred from friction side to positive jaw feed side. Contact I84 is opened upon completion of engagement of the jaw clutch side of the rapid traverse clutch, therebv ole-energizing coil RMR, opening contacts RMRa, and de-energizing the rapid traverse clutch actuator motor.

There has thus been provided, in a milling machine having a knee, saddle, and table, whose movements are controlled by electrically operated mechanism, an electrical interlock arrangem'ent wh reby no harm can come to the machine elements in the event an operator inadvertently operates more than one of the control levers for the respecti e table, saddle, and knee members. In this arrangement, whenever the work table control lever is so positioned for forward or reverse feed or rapid traverse and the operator should also actuate the saddle control lever for in and out movements or the knee control lever for up and down movements, the table is automatically stopped, together with the respective saddle and knee which it was attempted to also operate with the operation of the table. Similarl when a certain series of saddle movements have been established and the knee or table control lever should be op rated, again the respective members are all stopped automatically. Also, when the nee is set in predet rmined movements up and do n. operation of either the table or saddle control le ers also stops opera- Emergency stop control mechanism In order to provide means for at any time bringing the machine to a stop in case of an emergency, there is provided an emergency stop button contact I98 so connected that, upon depression of the stop button, all motions, in either direction, of the table, saddle, knee, and spindle rotation cease and will not be resumed upon release of the emergency stop button I98 until all control levers have first been returned to their neutral positions. When the stop button I98 is depressed, opening its contact, the coil LV is deenergized which opens contacts LVa and LVb which de-energizes coils FF and FR which opens contacts FRa and FBI), if previously closed, to deenergize the feed drive motor 69 and contact LVc to de-energize coil DMS which in turn opens contacts DMSa, de-energizing the spindle drive motor 23. Upon release of the stop button I98 to close its contact, coil LV is not energized because contact LVa is open so that contact I83 is open if the knee control lever is in any position other than neutral; contact ITS is open if the saddle control lever is in feed-in or rapid traverse in position; contact I8Ia is open if the saddle control lever is in feed-out or rapid traverse out position; and contact I12 is open if the table control lever is in any position other than neutral.

In order to cause the table, saddle, knee, and spindle to resume motion in any selected direction, all of the control levers are returned to neutral and the spindle start button I54 again depressed. Contacts I83, I18, IBM, and I12 are closed, completing circuit to energize coil LV which closes contact LVa, completing a second circuit to the coil LV; contact LVb closes and contact LVc closes.

Should a discontinuance of power supply to the machine take place or an exceptionally reduced voltage be present from the power supply, the same result will take place as in depressing the emergency stop button I98 to thereby deenergize the coil LV and repeat the operating conditions above recited.

An appropriate overload mechanism may be provided for cases where excess mechanical demand is imposed on the machine which might damage the feed drive mechanism which includes a torque release contact I99 being mechanically opened to de-energize the coils FF and FR, open- I ing contacts FFb and FRa to de-energize the feed drive motor. The torque limit contact I99 may be actuated by any suitable mechanism in conjunction with the load imposed on the feed mechanism such as that shown in application Serial No. 720,111, filed January 3, 1947, and now Patent No. 2,484,616, granted Oct. 11, 1949, but any other form of arrangement for releasing said contact in relation to the load on the feed drive may be utilized. Since the detail mechanism for operating the torque limit contact I99 forms no part of this invention, further specific description of the same is not believed required.

Automatic operating and control mechanism work table which actuate a series of electrical.

control switches or contacts as the table moves back and forth in the operating cycle. This arrangement is best shown in Figures 3 and 4. On

1 7 the front of the work table 22 is rigidly mounted a bracket 200 by suitable screws 20! which has formed on it a dog-carrying dovetail 202. A dog 203 is clamped to the dovetail by a suitable screw 204 at such a place that a lever 205 is actuated by the dog so as to move its outer end inwardly,

rocking the shaft 206 journaled in the saddle of the milling machine and having a lever member 201 on its lower end engaging an appropriate micro-switch contact 208 whenever the table has reached a point in its movement where it is desired to have the table alter its speed from a feed rate to a rapid traverse rate in the left-hand direction, Figure 3.

A dog 209 is mounted on the dovetail 202 at such a place that the lever 2I0 on the rock shaft 2ll has an arm 212 which actuates micro-limit switch contact 2l3 whenever the table has reached a point in its movement where it is desired to have the table alter tis speed from a rapid traverse rate to a feed rate while moving in the left-hand direction. v

A dog 214 carried on the dovetail 202 is positioned so that it will engage and operate the lever 2l on the rock shaft 2|6 having a lever 2l1 engaging a micro-limit switch contact 2I8 whenever the table has reached a point in its movement where it is desired to have the table cease motion to the left, except where it is desired to have the table immediately resume motion to the right.

Attached to the dovetail 202 is the trip dog 2l9 at such a place that it actuates the lever 2l5 so as to operate the micro-switch 2l8 whenever the table has reached a point where it is desired to have the table reverse its direction of motion from left to right.

A trip dog 220 is carried on'the dovetail 202 at such a place that it engages a lever 22l on the rock shaft 222 having a lever 223 engaging the micro-switch 224 whenever the table has reached a point in its movement where it is desired to have the table alter its speed from a feed rate to the rapid traverse rate in the right-hand direction.

A dog 225 carried on the dovetail 202 engages the lever 226 on the rock shaft 221 havin the lever arm 228 engaging the micro-switch 229 whenever the table has reached a point in its movement where it is desired to have the table alter itsspeed from the rapid traverse rate to the feed rate in the right-hand direction.

A trip 230 is carried on the dovetail 202 at such a placethat the lever 23! is actuated so as to rock its shaft 232 and the lever arm 233 to actuate the limit switch 234 whenever the table has reached the point in its movement where it is desired to have the table cease motion to the right, except where it is desired to have the table'immediately resume motion to the left.

A dog 235 is mounted on the dovetail 202 at such a place that the lever 23! is actuated by it whenever the table has reached a point in its movement where it is desired to have the table reverse its direction of motion from right to left.

To start the automatic feed cycle of the work table after having set the control dogs on the dovetail 202 as above described, the table control lever is moved to feed position in the same direction as it is desired to have the table begin its motion. The various electrical devices above-described will be set in accordance with these movements of the table control lever It! as described.

The cycle start button 236 is then momentarily depressed which completes a circuit through con-.

tact TCRc which is closed by the previous energizing of coil TCR. to cause coil AR-l to be energized, closing contact AR-la, which completes a second circuit to the coil ARI-l, and closing contacts AR-Ib and AR-lc and opening contacts AR-Id and AR-Ee and contact AR-i to energize coil AR-Z which closes contacts AR-Za, AR-Zb, and Aft-2c.

When the table, moving to the left at feed rate, reaches a point that the dog 203 operates the associated lever 205, the table will alter its speed from the feed rate to the rapid traverse rate. Contact 205 closes, completing circuit to coil RM, closing contact RMa and closing contact RMc to energize coil RM, closing contact RMb to energize coil RMF, closing contacts RMFa, thereb energizing the rapid traverse clutch actuator motor in the forward direction with the result that contact I84 is closed and the rapid traverse clutch H0 is transfered from feed jaw side to friction rapid traverse side.

When the table is moving to the left at rapid traverse rate and reaches a point where the dog 209 operates lever 210, the table will alter its speed from the rapid traverse rate to the feed rate. Contact 231 is opened, de-energizing coil RM which opens contacts RMc to de-energize coil RMF, closing contact RMa to energize coil RMR, since contact I34 is closed, closing contacts RMRa to energize the rapid traverse clutch actuator motor in reverse direction to return the rapid traverse clutch from rapid traverse friction side to positive jaw feed side and to open contact I84 upon completion of this shift of the clutch to thereby de-energize coil RMR to again open contacts RMRa de-energizing rapid traverse clutch actuator motor.

When the table is moving to the left at either feed or rapid traverse rate and reaches such a point that the dog 2I4 operates the lever 215, the table will stop and will not resume automatic operation until the table control lever is returned to neutral, the table control lever moved to the feed position in the direction it is desired to have the table again move, and the cycle start button again momentarily depressed. Contact 2|8 is opened, de-energizing coil FMF, opening contact FMFa to de-energize coil FF, opening contacts FFb to de-energize the feed motor in forward di- 'rection. Also, the rapid traverse clutch, if engaged on the friction side, is transferred to feed jaw side as when contact 231 is opened by dog 209 engaging lever 2l0.

When the table, moving to the left at either feed or rapid traverse rates, reaches such a point that the dog 2|9 operates the lever 215, the table will cease motion to the left and will move to the right at feed rate. Contact 238 is closed; contact 2!!! is opened, de-energizing coil FF which opens contacts FFb, de-energizing the feed motor in forward direction and de-energizing coil FMF which closes contact FMFb which, since contact TCRd is closed by previous energizing of coil TCR, completes the circuit to coil FMR which closes contact FMRa, completing circuit to coil FR to close contacts FRA, energizing the feed drive motor in reverse direction.

When the table is moving to the right at feed rate and reaches a point such that the the dog 220 operates the lever 22!, the table will alter its speed from the feed rate to the rapid traverse rate. Contact 224 is closed, energizing coil RM, openin contact RMa and closing contacts RMd and RMb which maintain energization to coil RM and energize coil RMF, closing contacts RMFa,

19 thereby energizing therapid traverse clutch actuator motor in forward direction which results in closing of contact 184 and causing the rapid traverse clutch to be transferred from the jaw side to friction side for rapid traverse movement to the table screw.

When the table, moving to the right at rapid traverse rate, reaches a point that the dog 225 operates the lever 226, the table will alter its speed from the rapid traverse rate to feed rate. Contact 239 is opened, de-energizing coil RM and opening contacts RlVId and RMb, de-energizing coil RMF and closing contact RMa to energize coil RMR, since contact ltd is closed, closing contacts RMRa, energizing the rapid traverse clutch actuator motor in reverse direction with the result that the rapid-traverse clutch is transferred from friction side to positive jaw feed side and contact 184 is opened upon completion of engage- -ment of the jaw clutch of the rapid traverse clutch thereby de-energizing the coil RMR, opening the contacts RMRa and de-energizing the rapid traverse clutch actuator motor.

When the table is moving to the right at either feed or rapid traverse rates and reaches a point that the dog- 23fl operates the lever 23!, the table will stop and will not resume automatic motion until the table control lever is returned to neutral. Contact 240 is opened, de-energizing coil FMR, opening contact FM'Ra to de-energize. coil FR, opening contacts FRa, de-energizing the feed motor in reverse direction. Also, the rapid'traverse clutch, if engaged on the friction side, is transferred to jaw side-as when contact 224 is opened as described.

When the table, moving to the right at either feed or rapid traverse rates, reaches such a point that the dog 235' operates lever 23!, the table ceases motion to the right and will move to the left at feed-rate. Contact 24! is closed and contact 240 is opened, de-energizingcoil FR and opening contacts FR'a, die-energizing the feed motor in reverse direction and breaking the circuit to coil FMR which closes contact FMRb which completes, through the closed contact TCRd, the.

circuit to the coil FMF which closes contact FMFa to energize coil FF and close contact FFb, energizing the feed drive motorinforward direction.

In a similar fashion, trip arrangements are provided, as shown in Figure 2, at S for automatically controlling the saddle in and'out movement at feed or rapid traverse in either direction and at K for the vertical movements of the knee,

this arrangement being substantially the same asv that shown in Figures 3 and 4 above described. The electric circuit, is slightly modified to accommodate-the saddle control and the'knee control in the same electrical control circuit shown in Figure? byproviding switches 213a: and 229.7: which function the sameas the switches 2 I3 and 229 for the table, as described.- Also, switches 205:0 and 224cc areprovided to function in connection with saddle movements the same asthe switches 205 and 224, respectively, do for the table movement, as described. In a similar fashion, switches ZIBy-and 229g are provided for knee movements and function-the-same asthe switches H3 and 229 for the table and also switches 205y and 2241 are provided and function the same for knee movements as: the switches 205 and 224 do for table movements as described. Thus, all three members, the knee, saddle, and table, may be operated in automatic feed, rapid traverse, and

reversing cycles for. any character of work to be. 'done.

brought to a stop or are reversed,,the coil FMF The operation of the spindle drive motor 23 is controlled in coordination with the automatic feed cycle above described so that the cutter spindle is stopped and started at desired times in the cycle. One arrangement is to have the cutter spindle running only when the table is being'fed to the left, the saddle is being fed in, or the knee is being fed up. These motions to the table, saddle, and knee are effected by manipulating their associated control levers lfil, I16,

and H31, respectively, to control the electric circuit as described. When any of these control levers are moved to a feed position in the direction it is desired to' actuate the respective knee, saddle, and table above, the coil FMF is energized so as to close contact FMFc which, if switch I56 has been previously manipulated so as to maintain contact l56a open and contact I561) closed, in turn energizes coil DMS which closes contacts DMSa energizing the spindle motor.

When such table movements to the left, saddle movements in, or knee movements up are changed from feed rate to rapid traverse rate by the trip dog mechanism described, the coil RMF, which is energized, also opens contact RMFc to deenergize coil DMS which opens contacts DMSa,

de-energizing the spindle drive motor.

When the knee, saddle, or table are moving to the left in or up, respectively, at rapid traverse-rate and are changed to feed rate by the above described trip dog mechanism, the coil EMF, which is energized, also closes contact RMFc to again energize coil DMS which closes contacts DMSa and energizes the spindle motor.

In instances where the knee, saddle, and table 'movingas above described is'stopped or reversed,

coil FMF, which is energized; opens contact FMFc to de-energize coil DMS which opens contacts DMSa to de-energize the spindle drive mo tor to bring the cutter spindle to rest.

The spindle motor is also controlled in a similar fashion when the work table is being moved to the right, the saddle out, and the knee down by appropriately operating their respective control levers. When these respective members are placed in feed" motions in these directions, the coil, FMR is energized to close contact FMRc which, if switch I56 has been previously manipulated in such a way as to maintain contact l58a closed and contact [53b open and contact [55c open and contact-[56d closed, will energize coil DMS which closes contacts DMSa to energize the spindle drive motor.. When these motions of the respective machine members change from feed to rapidztraverse by the automatic trip dog mechanism, the coil RNF is energized to open contact RMFFc to tie-energize coil DMS to open contacts DMSa, ole-energizing the spindle drive. motor. When these respective machine members change from: a rapid traverse back to a feed motion, the coil: EMF-being de-energized-closes contact RMFc to energize coil DMS, closing contacts DMSa to energize the spindle motor.

When the. various machine members are also opens contact FMRc, de-energizing coil DMS to open contacts DMSa, to de-energize the spindle drive motor.

There has thus been provided a control arrangementwherebythe. spindle drive motor and cutter spindle are stopped and started in direct relationship to the automatic cycle of applying feed or rapid traverse motion to the respective machine. members or in reversing the motion to the machine member. Thus, in this arrange- 21 ment, whenever the knee, saddle, and table are feeding to the left, the saddle in, or the knee up, the spindle is running, but when these'members are movingin these directions at rapid traverse or reversed from these directions, the spindle drive motor is stopped. The sameis also effective in instances where thetable is feeding to the right, the saddle out, and the knee down. All of the above motions are initiated'by the manual control levers and electric circuit mechanism which also includes the electrical interlock mechanism which is effective at all times, as described,

during the respective motions of the knee, saddle, and table. .7

' While the apparatus herein disclosed and dcscribed constitutes a preferred form of the invention, it is to be understood that the apparatus is capable of mechanical alteration without departing from the spirit of the invention-and that such mechanical arrangements and commercial adaptations as fall within the scope of the appendant claims are intended to be included herein.

Having thus fully set forth and described this invention, what is claimed as new and desired to be secured by United States Letters Patent is:.

1. In a milling machine feed and rapid traverse transmission and control mechanism having a drive motor, a rapid traverse power take-01f from said motor, a feed take-off drive from said motor including an infinitely variable speed V -belt drive transmission, a common feed and rapid traverse output drive shaft, clutch means associated with said shaft for applying a rapid traverse drive or a feed drive from said variable speed transmission to said shaft, and individual power transmissions connectable to said drive shaft for actuating the knee, saddle, and table members or said milling machine, an electric rapid traverse and feed clutch actuator motor connected to operate said clutch, and electric control switch means actuated by the operation ofrsaid rapid traverse and feed clutch actuator motor upon movement of said clutch to feed engaged position to de-energize said actuator motor.

2. In a milling machine feed and rapid traverse transmission and control mechanism having a drive motor, a rapid traverse power take-off from said motor, afeed take-off drive from said motor including an infinitely variable speed V-belt drive transmission, a common feed and rapidtraverse output drive shaft, clutch means associated with said shaftfor applying a rapid traverse drive or a feed drive from said variable speed transmission to said shaft, and individual power transmissions connectable to said drive shaft for actuating the knee, saddle, and table members ofsaid milling machine, an electric rapid traverse and feed clutch actuator motor connected to operate said clutch, and electric control switch means actuated by the operation of said rapid traverse and feed clutch actuator motor upon movement of said clutch to feed engaged position to deenergize said actuator motor, said transmissions interconnecting said output drive shaft to said knee, saddle, and table members including a disengaged clutch for each said saddle, knee, and table, individual electric actuator motors for clutch members to engaged or disengaged positions, and control lever means for each, said knee,

' saddlaand table operable to' adjust electric con v trol and power supply apparatus to'said clutch 22 actuator motors whereby the manual operation of said motors effects power engagement or disengagement of said individual clutch devices for the knee, saddle, and table.

3. In a milling machine feed and rapid traverse transmission and control mechanism having a i drive motor, a rapid traverse power take-ofi from said motor, a feedtake-oif drive from said motor including an infinitely variable speed V -beltdrive movement of said clutch to feed engaged position .said motor speed V-belt drive transmission, a common feed to de-energize said actuator motor, said transmissions interconnecting said output drive shaft to said knee, saddle, and table members including a disengaged clutch for each said saddle, knee, and table, individual electric actuator motors for shifting each of said clutches, and limit switch control mechanisms associated with each of said actuators to automatically stop operation of said actuators when they have shifted the respective clutch members to engaged or disengaged positions, and control lever means for each said knee, saddle, and table operable to adjust electric control and power supply apparatus to said clutch actuator motors whereby the manual operation ofsaid motors effects power engagement or disengagement of said individual clutch devices for the knee, saddle, and table, and automatic trip dog control mechanism operable to control said electrical control and power supply mechanism for operating the rapid traverse and feed clutch actuator motor and the individual actuator motors for the disconnect clutches, for the knee, saddle, and table in a predetermined sequential relationship. 4. In a milling machine feed and rapid traverse transmission and control mechanism having a drive motor, a rapid traverse power takeoff from said motor," a feed take-off'drive. from including an infinitely variable and rapid traverse output drive shaft, clutch means associated with said shaft for applying a rapid traverse drive or a feed drive from said variable speed transmission to said shaft, and individual power transmissions connectable to said drive shaft for actuating the knee, saddle, and table members, of said milling machine, an electric rapid traverse and feed clutch actuator motor connected to operate said clutch,

and electric control switch means actuated by the operation of said rapid traverse and feed clutch actuator motor upon movement of said clutch to feed engaged position to de-energize said actuator motor, said, transmissions interconnecting said output drive shaft to said knee,

saddle, and table members including adisengaged clutchfor each said knee, saddle, and table, individual electric actuator motors for shifting each of said clutches, and limit switch control mechanisms associated with each of said actuators to automatically stop operation of said actuators when they have shifted the re- 'spective clutch members to engaged or disen- "gagedpositions, and control levermeans'for circuit operable by the relative movement of the knee, saddle, and table members to effect an automatic sequential operation of said reversible feed and rapid traverse drive motor, the rapid traverse and feed clutch actuator, and the individual disconnect clutch actuator to effect an automatic cyclical operation of the machine.

11. In amilling machine transmission and controlimechanism, a reversible feed and rapid traverse drive motor, transmission mechanism including a direct positive rapid traverse drive and a variable feed rate drive and clutch means for alternately applying one or the other of said drives to an output drive shaft, transmission mechanism including individual disconnect clutches for the knee, saddle, and table members of the milling machine, electric power operated actuators for each of said disconnect clutches,

manual control levers each for the knee, saddle,

and table members, an cectrical control circuit including switching mechanism operated by said control levers for controlling the application of electric power to said reversible feed and rapid traverse drive motor, and trip dog actuated switch means also associated with said electric control circuit operable by the relative movement of the knee, saddle, and table members to effect an automatic sequential operation of said reversible feed and rapid traverse drive motor, the rapid traverse and feed clutch actuator, and the individual disconnect clutch actuators to effect an automatic cyclical operation of the machine, and common electrical interlock mechanism between said levers and the trip operated mechanisms for the knee, saddle, and table members effective at all times to prevent simultaneous operation of any two or more of said knee, saddle, and table members.

, 12. In a, milling machine having a mO-VELbIc work holding member, a feed and rapid traverse transmission including a reversible drive motor adapted to actuate said work holding member, a disconnect clutch between said feed and rapid traverse transmission and said actuable member operated by an electric power motor for-engaging and disengaging said disconnect clutch, and a control lever movable in the direction of desired travel of said Work holding member, an electric circuit having switch means operable by said lever for applying power to said feed drive motor, said feed. and rapid traverse actuator, and said disconnect clutch to eflect feed and rapid traverse movements in said member in either direction or to stop said movement.

a 13. In a milling machine having a movable work holding member, a feed and rapid traverse transmission including a reversible drive motor adapted to actuate said work holding member, a disconnect clutch between saidfeed and rapid traverse transmission and said actuable member operated by an electric power motor for engaging and disengaging said disconnect clutch, and a control lever movable in the direction of desired travel of said work holding member, an electric circuit having switch means operable by said lever for applying power to said feed drive motor, said feed and rapid traverse actuator, and said disconnect clutch toeffect feed and rapid traverse movements in said member in either direction or to stop said movement, switch means associated with said feed and rapid traverse actuator for arresting movement of said actuator upon the engagement of the feed drive power of said transmission, and switch means associated with the, actuator for said disconnect ,clutchautor.

matically efiective to de-energize said actuator for the clutch when said motor has completed an engagement or a disengagement of the clutch as initiated by the movement of said control lever; 14. In a machine tool transmission and control mechanism for actuating and controlling the movement of the work holding member of the milling machine, the combination of a reversible feed and rapid traverse drive motor, transmission means associated with said motor for applying the feed or rapid traverse drive to the member to be actuated, power operated clutch mechanism for effecting feed or rapid traverse drive, a feed disconnect clutch between the output of said feed and rapid traverse drive and the member to be actuated, electric power means for engaging and disengaging said disconnect means, a control lever movable from a neutral position to each side thereof first to a detented position of feed in either direction and then to an undetented further position of rapid traverse movement in either direction where said lever upon release automatically returns to said feed positions, electric switch means actuated by said lever to effect operation of said feed and rapid traverse drive motor and the rapid traverse and feed clutch and disconnect clutch actuators, and switch means for automatically de-energizing the feed and rapid traverse clutch actuator when it has moved the clutch device to feed position, switch means for de-energizing said disconnect clutch actuator after it has moved the disconnect clutch either to fully engaged or fully disengaged position, and further switch means operated by said control lever when in neutral position to so energize said actuator for the disconnect clutch to cause said clutch to be maintained in a disconnected position, and switch means operated by the movement of said lever either side of neutral position to efiect the reversal of operation of said feed and rapid traverse drive motor.

15. In a machine tool transmission and control mechanism for actuating and controlling the movement of the work holding member of the milling machine, the combination of a reversible feed and rapid traverse drive motor, transmission means associated with said motor for applying the feed or rapid traverse drive to the member to be actuated, power operated clutch mechanism for effecting feed or rapid traverse drive, a feed disconnect clutch between the output of said feed and rapid traverse drive and the member to be actuated, electric power means for engaging and disengaging said disconnect means, a control lever movable from a neutral position to each side thereof first to a detented position of feed in either direction and then to an undetented further position of rapid traverse movement in either direction where said lever upon release automatically returns to said feed positions, electric switch means actuated by said lever to effect operation of said feed and rapid traverse drive motor and the rapid traverse and feed clutch and disconnect clutch actuators, and switch means for automatically de-energizing the feed and rapid traverse clutch actuator when ithas moved the clutch device to feed position, switch means for de-energizing said disconnect clutch actuator after it has moved the disconnect clutch either to fully engaged or fully disengaged posi-' tion, and further switch means operated by said control lever when in neutral position to so energize said actuator for .the disconnect clutch to cause; said clutch to be maintained in-adiscon- 

